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. UNITED STATES PATENT OFFICEQ THOMAS COLGAN, or BROOKLYN, NEW YORK.

LUBRICANT FOR'STEAM-CYLINDERS.

SPECIFICATION forming part of Letters Patent No. 280,134, dated June 26,1883.

Application filed December 9, 1882. (No specimens.)

To all whom it may concern:

Be it known that I, THOMAS COLGAN, of Brooklyn, in the county of Kingsand State of New York, have invented a new and useful Improvement inLubricants for Steam-Cylinders and I do hereby declare that thefollowing is a full and exact description thereof.

My inventionrelates to a lubricant specially adapted for the valves andcylinders of steamengines, as an improved substitute for thecylinder-oils now in use.

The object of said invention is to obtain a durable lubricant in solidform entirely free from gum, and which shall possess such cleansingqualities as that it will render and keep the bearings constantly brightand clean;

It'consists in the addition of beeswax to a compound of petroleum,parafiine, and plumbago, prepared substantially in the following mannerand proportions The petroleum is first condensed by heating andagitating it for two or three hours (more or less) until its morevolatile constituents are evaporated therefrom. In this process the oilmay be heated to the boiling-point. To this condensed petroleum, whileyet hot, I add beeswax, paraffine, and finely-pulverized plumbago, inabout the proportions of sixteen ounces petroleum, one to eight ouncesof beeswax, one to eight ounces of parafline, and one to eight ounces ofplumbago, the proportions being varied according to the density requiredin the product, and which is determined, to some extent, by the marketin which it is to be sold, whether in a cold or hot climate. Thecompound is kept in steam valves and cylinders.

hot and thoroughly agitated during the process of admixture to insure anintimate combination of its elements, and is then poured into molds,preferably spherical in form and of various sizes, and allowed tosolidify therein. When cold, the lubricating compound becomes hard andsolid, and for use these solid balls are dropped into thelubricating-cups of the engine, where the heat will melt them asrequired.-

My Letters Patent N 0. 241,932, of May 24,

1881, describe a lubricating compound composed of petroleum, paraffine,and plumbago;

admixed in substantially the proportions set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

THOMAS COLGAN.

WVitnesses: J. F. ACKER, J r., DAVID A. BURR.

